Replace win32-g++ with mingw scope

Commit 773dd01 in qtbase introduced a general mingw platform scope, which
is cleaner and more flexible than matching the spec name.

(see 278152fff for a similar commit in qtbase).

Change-Id: I36449cfa199db8bd25ffb0f7b384346cd74897d8
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

examples/activeqt/activeqt.pro

@@ -11,4 +11,4 @@ contains(QT_CONFIG, opengl):!contains(QT_CONFIG, opengles2):SUBDIRS += opengl
 
 # For now only the contain examples with mingw, for the others you need
 # an IDL compiler
-win32-g++*|wince*:SUBDIRS = webbrowser
+mingw|wince*:SUBDIRS = webbrowser

src/activeqt/axshared.prx

@@ -9,7 +9,7 @@ QT += gui-private
 
 LIBS_PRIVATE += -lole32 -loleaut32
 !wince*: LIBS_PRIVATE += -luser32 -lgdi32 -ladvapi32
-win32-g++*: LIBS_PRIVATE += -luuid
+mingw: LIBS_PRIVATE += -luuid
 
 HEADERS = \
     shared/qaxtypefunctions.h \

tools/testcon/testcon.pro

@@ -8,7 +8,7 @@ HEADERS  = docuwindow.h mainwindow.h invokemethod.h changeproperties.h ambientpr
 FORMS    = mainwindow.ui invokemethod.ui changeproperties.ui ambientproperties.ui controlinfo.ui
 RC_FILE  = testcon.rc
 
-!win32-g++*:QMAKE_POST_LINK = midl $$shell_quote($$shell_path($$PWD/testcon.idl)) && move testcon.tlb $(TARGETDIR)
+!mingw:QMAKE_POST_LINK = midl $$shell_quote($$shell_path($$PWD/testcon.idl)) && move testcon.tlb $(TARGETDIR)
 
 target.path = $$[QT_INSTALL_BINS]
 INSTALLS += target